pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-36007-k.ps) >>/Users/jc/w/tmp/Tune-36007-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/k.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-36007-get.log 6404 Log file, useful mostly for debugging
Tune-36007-k.abc 283 ABC music file with the extracted tune(s)
Tune-36007-k.ps 34149 PostScript
Tune-36007-k.txt 283 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.